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Origins and History of the Teesdale Flora

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Origins and History of the Teesdale Flora Origins and history of the Teesdale flora Margaret E Bradshaw and Judith Turner Botanists know the remarkable collection of plants of outstanding scientific interest, referred to in the last chapter, as the ‘Teesdale Assemblage’. The first record to be published was of shrubby cinquefoil (Potentilla fruticosa) by John Ray in 1677. This plant had almost certainly been shown to him on the south bank of the River Tees below Thorpe and Egglestone Abbey by Ralph Johnson (1629-95), naturalist and Vicar of Brignall. Studies by Horsman (1995) also show that Johnson knew the wild and remote parts of the upper Dale. In addition to shrubby cinquefoil, he had found northern bedstraw (Galium boreale), alpine bistort (Persicaria bistorta), native rosebay willow-herb (Chamerian angustifolium), spring sandwort (Minuartia verna), starry, mossy and hairy saxifrage (Saxifraga stellaris, S hypnoides, S. villosum), Jacob’s ladder (Polemonium caeruleum), alpine bartsia (Bartsia alpina), Scottish asphodel (Tofieldia pusillum), dwarf birch (Betula nana) and others. Unfortunately, these records were not made public at the time and much of this knowledge appears to have been lost. Five botanists in Upper Teesdale © Janet Rawlins At the end of the eighteenth century, William Oliver, a surgeon trained in Scotland with a knowledge of the Scottish mountain flora, arrived in Teesdale. Working alone or aided by Binks (a lead miner/and ‘simpler’), he made many discoveries or re-discoveries of the Teesdale flora. Fortunately, his association with Harriman was the first step that ensured his discoveries reached the learned members of the Linnean Society of London. The second edition of ‘A tour of Teesdale’ (Garland 1813) contained a list of over 15 plants, ‘which had been supplied by Mr Oliver, a local surgeon’. By the early part of the eighteenth century more species had been found, including spring gentian (Gentiana verna), mountain avens (Dryas octopetala), Teesdale (rock) violet (Viola rupestris), bog stitchwort (Minuartia stricta), bog orchid (Hammarbya paludosa) and bearberry (Arctostaphylos alpinus). The headstone of William Oliver in Middleton-in-Teesdale Mountains avens Churchyard. © Margaret E Bradshaw © Geoff Herbert In his flora, Baines (1840) included these and other members of the ‘Assemblage’ and a dense paragraph on plants on the Durham side of the Tees. One famous botanist, visiting Teesdale in 1842, recorded Scottish asphodel, hoary rock-rose (Helianthemum canum ssp. laevigatum), alpine bartsia, false sedge (Kobresia simpliciuscula) and ‘several others’ – what were these, apparently too well known by those energetic plant hunters that they were not worth listing in his diary? By 1863 Baker, in his Flora, lists at least 22 of the so-called ‘Teesdale Assemblage’. Further additions were made so that, almost one hundred years later Pigott (1956) gave some 70 flowering plants and as many lower plants of special phytogeographical interest. Surprisingly, the thrill of discovery in this well-worked area still exists, for in recent years new species have been added, species thought to be extinct have been re-found and other very local plants found in new places. Many of the species are widely distributed in the arctic and the high mountains of the northern hemisphere, and these belong to the arctic-alpine element, eg. Lady’s mantle (Alchemilla glomerulans), alpine bartisia, hair sedge (Carex capillarum), hoary whitlow grass (Draba incana), spring sandwort, alpine bistort, yellow saxifrage (Saxifraga aizoides) and alpine meadow- rue (Thalictrum alpinum); the arctic-sub-arctic element is represented by alpine foxtail (Alopecurus alpinus) (arctic foxtail would be more appropriate!) and another Lady’s mantle (Alchemilla wichurae); some have their main distribution in the mountains of central Europe and so are the alpine element: spring gentian, mossy saxifrage and alpine pennywort (Noccaea caerulescens); a northern montane element contains wood crane’s-bill (Geranium sylvaticum), bird’s eye primrose (Primula farinosa) and globeflower (Trollius europeus); others with a continental northern type of distribution in Europe are melancholy thistle (Cirsium heterophyllum), early spring sedge (Carex ericetorum) and Teesdale (rock) violet; more unexpected and significant are the continental southern species: hoary rockrose (Helianthemum canum spp. laevigatum) and horseshoe vetch (Hippocrepis comosa). Nowhere else in Britain do these species grow together. This is the real significance of the Teesdale Assemblage — relics of the Late-glacial/early Boreal periods 10/8,000 BC. Arctic-Alpine mountain avens, juxtaposed with southern species early spring sedge and small scabious on Cronkley Fell in 2017 © Margaret E Bradshaw Horseshoe vetch © Margaret E Bradshaw The specialness of the interest created by this unusual convergence of so many geographical elements is appreciated when they are considered in the context of the surrounding vegetation which is characterised by such typically west European species as heather or ling, cross-leaved heather, bog asphodel, heath rush and cotton-grass. The high proportion of arctic-alpine species in the Teesdale flora, the severe climatic features and the significant correlation between some at least of the rare plants and the peculiar metamorphosed ‘sugar limestone’ led to much speculation on the origin of the assemblage, culminating in the famous discussion at the Royal Society in 1935 (Royal Society, 1935). Today, it is generally agreed that the majority of the ‘Teesdale assemblage of plants’ are relics, which were widespread in much of Britain in the Late-glacial period and subsequent warmer periods. Fragmentation of their, then, more or less continuous distribution patterns took place during the subsequent warmer (forest) and later wetter (blanket-bog) periods. Nowhere else in Britain do these species grow together. This is the real significance of the Teesdale Assemblage A further special feature of interest exhibited by several of the rarities is that taxonomically they are represented in Teesdale by local races. In some cases, the divergence from other populations of the same species is sufficiently great to warrant their reclassification as a new sub-species. This is so in hoary rockrose, where the Teesdale population is Helianthemum ssp. laevigatum (Proctor 1956). Similarly, a Teesdale sub-species of the bitter milkwort (Polygala amarella) has been described by Fearn (1971). This species was nearly eliminated from Teesdale by botanists collecting the largest and most floriferous specimens. The plant is known now to be a short-lived perennial and therefore very dependent on successful seed production and germination to maintain the populations. Several species are represented in Teesdale by dwarf or smaller forms: Pigott (1956) points out that some of the Teesdale populations of alpine forget-me-not are much more dwarf than their Ben Lawers counterparts and Elkington (1964) confirms this is genetically controlled; Teesdale mountain avens has very small leaves which are maintained in cultivation; as are the genetic dwarf plants of hoary whitlow grass, Draba incana var. nana though these occur in other areas as well as Teesdale. Special studies by Elkington & Woodell (1963) on shrubby cinequefoil again reveal difference in leaf shape between Teesdale and Irish populations and Elkington (1963) also reports differences between the similarly situated populations of spring gentian. As the Teesdale assemblage of plants exhibits so many special features of interest, it is not surprising that it has excited much interest and speculation as to its origin and history. Wilmot (1930) and Blackburn (1931) suggested that the flora had survived the last main glaciation of Great Britain and perhaps also earlier ones on ice-free areas (nunataks) in the Teesdale uplands and whilst some of the species might well have done so, subsequent research work has shown that ten to twelve thousand years ago many of the characteristic Teesdale plants were widespread in the lowlands of England, Ireland and southern Scotland and for that matter in much of central Europe too. The evidence for this comes from the fossil content of deposits laid down during the late-glacial period. Thus from a late-glacial site at Neasham, near Darlington, Blackburn (1952) identified fossils of mountain avens, hoary rockrose, least willow (Salix herbacea) and tea-leaved willow, lesser clubmoss, alpine meadow rue and juniper, all of which, except the willow, occur in Upper Teesdale now and which must in late-glacial times have been constituents of the vegetation of the Darlington lowlands. From a site near London at Nazeing, Allison, Godwin and Warren (1952) identified fossils of shrubby cinquefoil, hoary whitlow grass, mountain avens etc., and pollen of Jacob’s ladder and rockrose; while Mitchell (1953) from similar deposits in Ireland has identified seeds of what is probably bog sandwort, now known in Britain only on Widdybank Fell. The position thus is that the fossil remains of practically all the Teesdale rarities have been recovered from late-glacial deposits in this country or on the continent. Some of this late-glacial flora is thought to have immigrated in late-glacial times from further south on the continent, over the dry bed of the southern North Sea or from refuges around our shores, which are now below sea-level, although some, particularly the hardier species, probably survived the glaciation in sheltered places in the ice-free part of southern Britain or even
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